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Effect of Increasing Reflectance on Yield, Growth, and Physiological Behavior of a Dryland Cotton Crop¹

The effect of kaolin reflectant sprays on the yield, physiological activity, and growth of ‘Acala SJ-2’ dryland cotton (Gossypium hirsutum L.) was studied during 2 successive years in separate field experiments. In the first experiment the treatment increased yield by 12.6%. In the second experiment a significant increase in the number of flowers resulted from the kaolin spray, but subsequent high rates of abscission prevented this spray from producing a significant increase in yield.

The reflectant sprays decreased the rate of ¹⁴CO₂ uptake due to a reduction in light absorption. A reduction in epidermal conductance due to partial physical blockage of the stomata was believed to cause the slower decrease in xylem leaf water potential which followed reflectant treatment. Plant growth, characterized by the stand's height, leaf area index, and dry weight, was not significantly affected.

Key Words: Photosynthesis • Stomatal conductance • Xylen water potential • Gossypium hirsutum L.

² Division of Agricultural Meteorology, Inst. of Soils and Water, Agric. Res. Org., The Volcani Ctr., Bet Dagan.

Received for publication May 24, 1979.

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